Force TETHER_ENABLE_SYNC_SM to be enabled by default on 25Q2+

Test: atest TetheringTests CtsTetheringTest
Change-Id: Id63b4535aaebe90d5fa663ad4584cfd987c3b06b
diff --git a/Tethering/src/com/android/networkstack/tethering/TetheringConfiguration.java b/Tethering/src/com/android/networkstack/tethering/TetheringConfiguration.java
index 3c91a1b..5f0e5d0 100644
--- a/Tethering/src/com/android/networkstack/tethering/TetheringConfiguration.java
+++ b/Tethering/src/com/android/networkstack/tethering/TetheringConfiguration.java
@@ -24,6 +24,7 @@
 import static android.provider.DeviceConfig.NAMESPACE_CONNECTIVITY;
 
 import static com.android.networkstack.apishim.ConstantsShim.KEY_CARRIER_SUPPORTS_TETHERING_BOOL;
+import static com.android.net.module.util.SdkUtil.isAtLeast25Q2;
 
 import android.content.ContentResolver;
 import android.content.Context;
@@ -395,7 +396,7 @@
      * use the async state machine.
      */
     public void readEnableSyncSM(final Context ctx) {
-        USE_SYNC_SM = mDeps.isFeatureNotChickenedOut(ctx, TETHER_ENABLE_SYNC_SM);
+        USE_SYNC_SM = isAtLeast25Q2() || mDeps.isFeatureNotChickenedOut(ctx, TETHER_ENABLE_SYNC_SM);
     }
 
     /** Does the dumping.*/
diff --git a/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringConfigurationTest.java b/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringConfigurationTest.java
index 0159573..c4c7c9c 100644
--- a/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringConfigurationTest.java
+++ b/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringConfigurationTest.java
@@ -63,6 +63,7 @@
 import com.android.internal.util.test.FakeSettingsProvider;
 import com.android.modules.utils.build.SdkLevel;
 import com.android.net.module.util.DeviceConfigUtils;
+import com.android.net.module.util.SdkUtil;
 import com.android.net.module.util.SharedLog;
 import com.android.testutils.DevSdkIgnoreRule;
 import com.android.testutils.DevSdkIgnoreRule.IgnoreAfter;
@@ -779,7 +780,10 @@
         setTetherEnableSyncSMFlagEnabled(true);
         assertEnableSyncSM(true);
 
-        setTetherEnableSyncSMFlagEnabled(false);
-        assertEnableSyncSM(false);
+        // Feature is enabled by default after 25Q2 release.
+        if (!SdkUtil.isAtLeast25Q2()) {
+            setTetherEnableSyncSMFlagEnabled(false);
+            assertEnableSyncSM(false);
+        }
     }
 }
diff --git a/staticlibs/framework/com/android/net/module/util/SdkUtil.java b/staticlibs/framework/com/android/net/module/util/SdkUtil.java
index 5006ba9..63558dd 100644
--- a/staticlibs/framework/com/android/net/module/util/SdkUtil.java
+++ b/staticlibs/framework/com/android/net/module/util/SdkUtil.java
@@ -16,7 +16,10 @@
 
 package com.android.net.module.util;
 
+import static android.os.Build.VERSION.SDK_INT;
+
 import android.annotation.Nullable;
+import android.os.Build;
 
 /**
  * Utilities to deal with multiple SDKs in a single mainline module.
@@ -46,4 +49,9 @@
             this.value = value;
         }
     }
+
+    /** Checks if the device is running on a release version of Android Baklava or newer */
+    public static boolean isAtLeast25Q2() {
+        return SDK_INT >= 36  || (SDK_INT == 35 && "Baklava".equals(Build.VERSION.CODENAME));
+    }
 }